Printing-plate-shaving machine.



M. A. MOKEB. PRINTING PLATE SHAVING MACHINE.

APPLIGATION FILED JUNE ze, 1909. 1,054,130. Pa6I136d'F8h25, 1913.

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M. A. MoKE'B.

PRINTING PLATE SIIAVING MACHINE.

myemne wwf m Patented Feb.25,1913.

APYLIATION FILED JUNE 26,1909.

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M. A. MUKEE.

PB/.INTING PLATE SHAVING MACHINE. APPLICATION FILED JUNE 26, 1909.

1,054, l 30. Patented Feb. 25, 1913.

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PMNTING-PLATE-SHAVING MACHINE.

1,05493@ specification of Letters'llatent. Pjmd lFb, 25, 9113,

Application led June 26, 1909. Serial No. 504,490. To all to/'tom t may concern: v exert pressure locally upon the back of the Be it brown that l, MILTON A. McKee, a resident of Westerly, in the county of Washington and State of Rhode Island, have invented a new and useful Printing-Plate-Shaving Machine, of which the following is a specification.

ln the treatment of printing plates it has been found that greater relief inthe blacker printing parts of the plate could be obtained if a greater quantity of metal could be stored on the back of the plate opposite 'the part needin the greater relief. This result has been o tained by the process of preparing printing plates as described and claimed in United States Letters Patent No. 857,531

be made the desired thickness.

dated .lune 18, 1907, in which steps are employed :v A matrix is prepared so as to predetermine just what changes shall in the printing tace of the plate to produce the desired result. The matrix is then placed face up upon the bed of a shaving machine with the printing plate face down thereupon in such position that the high and low portions of the matrix are in register with those portions of the plate which are to be made respectively low and elevated. The plate and matrix are then held rmly in position upon the bed of the shaving machine and the shaving knife is actuated either by moving the bed beneath the mite or bed, until the back the following of the plate 1s shaved to `When the plate is released, it will spring back to its normal position, leaving elevations and depressions along its back opposite to the depressions and elevations previously. formed or produced in the matrix. The plate while still in register with the matrix, may be subjected to heat and pressure to form permanently the desired depressions and elevations in the printing tace oi the plate. As the back of the rinting plate is engaged by the shaving kni e, the knife will tend to crowd the unsupported parts ot the plate away from the edge of the knife, so that the metal will be removed from the hack of the plate only at those portions opposite the high portions of the matrix.

This present invention is directed to the shaving machine and'has for its object to provide means such as a plurality of independent spring-pressed lingers' arranged to by moving the knife along theplate, 1n close proximit to the shavin knife, the said y g ife in crowding or forcing the metal away from the edge of the knife at the unsupported portions ot the plate for leaving a greater thickness vor storage of metal at such unsupported portions.

A practical embodiment of my invention is represented in the accompanying drawings in which,

Figure 1 represents a printing plate shaving machine in end elevation with my invention applied thereto, Fig. 2 is a top plan view of the same, Fig. 3 is an enlargeddetall longitudinal vertical section through the machine, Fig. t is an enlarged detail sect-ion taken in the plane of the line A-A of Fig. 5, Fig. 5 is an enlarged detail vertical longitudinal section at the shaving knife and spring-pressed lingers, illustrating the act-ion of the knife and fingers with respect to the back of the printing plate, Fig. 6 is an enlarged transverse detail sectlon of the inner spring-pressed plate holding roller, Fi 7 is an enlarged detail view, showing in si e elevation the device for adjusting the plate cramping roller, and Fig. 8 is an enlarged section taken in the plane of the line B-B ci Fig. 7.

The main frame of the shaving machine is denoted by 1 and its reciprocating bed by 2. rlhe bed rack is denoted by 3 and is driven backward and forward by a reversing pinion d mounted on a shaft 5 driven by a worm and gear connection 6, 7, from a drive shaft 8, which shaft in turn is driven from any suitable source of' power, such, for instance, as a reversing motor 9, by a belt and pulley connection l0, l1, 12. rlhe movement of the bed may be cally and may also be reversed manually by the starting and reversing lever 13. The movement of thebed may also be controlled by the starting lever 13. The ife controlling lever is denoted by lll. 'llhese levers are suitably connected to the parts which they control and as they form no part of the present invention, their operation will not be specifically describedherein. i

Theshaving knife is denoted by 15, and it is adjustably mounted on amember 16 which in turn is adjustably mounted u on the frame 17 adjustable in the main tp reversed automatingers serving to assist the rame 1.

'40 an adjusting nut 38 on the said screw bolt.

.1 55 of the roller 42. This roller 42 serves to m intenso extend for securing the flanges rigidly to the brackets 30 at any desired position within the limits of their rotative movements.

The plurality of independent spring- 7@ pressed lingers which exert their pressure upon the back of the plate as it passes beneath the shaving knife, serve to exert pressure locally along the plate, thus assisting the knife 'in crowding the unsup orted 75 parts of the plate away from the e ge of the Aknife for permitting portions ofthe The spring-pressed plate engaging roller 18 is mounted in the vertically adjustable knife carrying member 16. The vertical adjustments of the knife carrying member 16 are controlled by `a hand wheel 19 mounted in the frame 17, which hand wheel has a gear 2O which meshes with the gears 21, 22, xed

on vertical adjusting screws 23, 24, engaging vthe knife vcarrying member 16. A micrometer 10 adjustment of the knife carrying member 16 may be provided for by the use of a hand shaft 25 which has a worm and gear connec- -tion 26, 27, with the shank of the handle 19*.

This shaft 25 and its worm may be moved into and out of operative position' by a hand lever 28.

The above arts herein described also fOrm no part of this present invention and their operation will not be-specitically described herein. l 1

- The means which l have shown for exerting pressure upon the plate locally along the same, in close proximity to the knife, is constructed, arranged and operated vas follows: A plurality of spring-pressed fingers are mounted uponl a cross shaft 29 carried by brackets 30 forming a fixed part of the knife carrying member 16. Each of these fingerscomprises a downwardly and 30 inwardly extended arm 31 and an upwardly plate opposite the raised portions of the matrix to be removed in a series of shaving -operations by the knife. The shaving oper- 8G ation is continued until a full shaving is made covering the entire area of the back of the plate, or until the late has been shaved to thethickness desire While l have shown and described a` plurality of independent spring-pressed lingers arranged to exert pressure upon the back of the plate being shaved, it is to be understood that any other means may be employed for exerting pressure locally upon 9@ the plate at this point, without departing from the spirit and scope of this invention; hence l do not wish to limit myself strictly to the means herein set forth, but

What l claim is:

1. ln a machine of the character vdescribed, a shaving knife and means arranged to exert pressure locally upon the plate being shaved, along the same, in close proximity to the knife.

2. ln a -machine of the character described, a shaving knife and a plurality of independent devices arranged in close proximity to one another each arranged to exert pressure locally upon the plate being ,shaved, in close proximity tol the knife.

. 3. ln a machine of the character described, a shaving knife and a plurality of independent spring-pressed lingers ar ranged in close proximity to one another, 1ro each arranged to exert pressure locally upon the plate being shaved, in close proximity to the knife.

4. ln a machine of the character described, a shaving knife and a plurality of M5 independent devices arranged in close proximity to one another each including al roller, arranged to exert a rolling pressure locally upon the plate being shaved, in close proximity to the knife.

5. ln a machine of the character described, a shaving knife and a plurality of independent .spring-pressed lingers arranged in close proximity to one another, each having a roller arranged to exert a 125 'rolling pressure locally upon the plate being shaved, in close proximity to the knife.

6. ln a machine of the character described, a shaving knife and means arranged to exert pressure locally upon the 13o extended arm 32.V The arm 31 is provided with a barreled roller 33 arranged to roll along the back of the printing plate 34 inclese proximity to theshavingknife 15. A

3,5 screw bolt 35 extends forwardly from the uprising arm 32 of each spring-pressed finger, which bolt passes through a cross piece 36 of the brackets 30. A spring 37 is interposed between the cross p1ece 36 and An adjusting nut 39 on the screw bolt 35, in front of the cross piece 36, serves to limit the inward movementof the arm 32 of the spring-pressed linger and thereby the 45 downward movement of the arm 31. The tension of the spring 37 may be adjusted by the nut 38. These nuts 38, 39, may be provided with `lock nuts 40, 41, for locking the nuts 38, 39, in their adjusted position.

5o A cramping roller 42 is carried by arms 43 supported upon a cross `shaft 44 mounted eccentrically in bushings 46 rotatably mounted in the brackets 30. Stops 45 on the brackets 30 limit the' inward movement Vhold the printing plate and its interposed matrix rmly down upon the bed 2 of the machine as the plate 1s passed beneath the shaving knife 15.

.sa Means are provided for adjusting the cramping roller 42 toward and away from the bed 2, which means consists in the presentinstance, of flanges 47 on the eccentric bushing 46, which flanges have elongated 65 slots 48 through which clamping bolts 49 mosaico plate being shaved, along the same, in close proximity to the knife, and means for regulat-ing said pressure.

7. ln a machine of the character described, a shaving knife, a plurality of independent devices arranged in close proximity to one another, each arranged to exert pressure locally upon the plate being shaved, in close proximity to the knife, and means for regulating the pressure on each of the de- VICGS.

8. ln a machine of the character described, a shaving knife, a plurality of independent spring-pressed iingers arranged in close proximity to one another each arranged to exert pressure locally upon the late being shaved, in close proximity to the knife, and means for adjusting the spring tension of each of the ingers.

9. In a machine of the character described, a shaving knife, a plurality of spring-pressed fingers arranged in close proximity to one another eachvarranged to exert pressure locally upon the plate bein shaved, in close proximity to the knife, an

adjustable means for limiting the down- Ward movement of each of the lingers.

l0. In a machine of the character described, a shaving knife, a plurality of spring-pressed fingers each arranged to exert pressure locally upon the plate being shaved, in close proximity fto the knife, means for adjusting the spring tension of the fingers, and adjustable means for limiting the downward movement of the lingers.

l1, ln a machine of the character described, a shaving knife, its support, a plurality of independent devices carried by saidsupport, each arranged to exert pressure locally upon the plate being shaved, in vclose proximity to the knife, and a cramping roller carried by the knife support in front of the said independent devices. i

12. In a machine of the character described, a shaving knife, its support, a plural/ity of independent said support, each arranged to exert pressure locally upon the plate being shaved, in close proximity to the knife, and a vertically adjustable cramping roller carried bv devices carried by the knife support in rfront of said independent devices.

ln testimony, that I claim the foregoing as my invention, li have signed my name in presence of two witnesses, this 14th day of J une, 1909.

MILTUN A. MCKEE. 

